当 uitableView 滚动到其内容限制时，不需要的空白“在”uitableView 子视图下

Question

我有一个 UITableViewCell 作为自定义视图控制器中的子视图。它工作得很好，只是当它滚动到其 contentSize 限制的顶部或底部时，它“继续前进”并在其后面留下一些空白区域。这尤其令人恼火，因为我确实有一个 UIView 覆盖了 tableView 后面的整个屏幕，并且该视图设置为非白色。我还添加了一个子视图，它恰好位于具有相同背景颜色的 tableview 之下，再次尝试阻止白色。我还将 UIApplication Window 背景颜色设置为非白色。这些都不起作用。

我会认为即使我的 TableView 在其原始框架周围反弹，“暴露”视图也应该与底层视图匹配，而不是白色。如何修复我的 tableView 以使其保留所有滚动属性，但在滚动结束时反弹时不会显示白色？

这是效果的屏幕截图。白色出现在 tableViewHeader 和占据屏幕顶部的 UISCrollView 下方。当我将 tableView 一直滚动到一个极端时，就会出现这种情况。如果我一直滚动到另一端，则空白会出现在 tableView 的底部而不是顶部。

这是相关的代码，我觉得很普通：

@interface JudgeViewController () <UITextFieldDelegate, UITextViewDelegate, UINavigationControllerDelegate, UIGestureRecognizerDelegate, UITableViewDataSource, UITableViewDelegate,  UIViewControllerRestoration, UIScrollViewDelegate>
@property (nonatomic) UITableView *tableView;
@end

设置tableViewCells的函数

#pragma mark - tableview appearance and actions

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath
{
    StatsViewController *svc  = [[StatsViewController alloc] init];
    svc.user = self.object.answerUser[indexPath.row];
    svc.fromJudge = YES;

    [self.navigationController pushViewController:svc animated:YES];

}

- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
    return [self.object.answerArray count];
}



-(UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
    UITableViewCell *cell;
    UILabel *label = nil;
    cell = [tableView dequeueReusableCellWithIdentifier:@"Cell"];
    if(cell ==nil)
    {
        cell = [[UITableViewCell alloc] initWithFrame:CGRectZero];
        label = [[UILabel alloc] initWithFrame:CGRectZero];
        [label setLineBreakMode: UILineBreakModeWordWrap];
        [label setMinimumFontSize:SMALL_FONT_SIZE];
        [label setNumberOfLines:0];
        [label setFont:[UIFont systemFontOfSize:SMALL_FONT_SIZE]];
        [label setTag:1];

        // [[label layer] setBorderWidth:2.0f];


        [[cell contentView] addSubview:label];

    }


    CGFloat width = [[UIScreen mainScreen] bounds].size.width;
    CGFloat height = [[UIScreen mainScreen] bounds].size.height;


    NSString *text = self.object.answerArray[indexPath.row];
    CGSize constraint = CGSizeMake(.8*CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN)*2, 200000.0f);
    CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:SMALL_FONT_SIZE] constrainedToSize:constraint];

    if(!label)
        label = (UILabel *)[cell viewWithTag:1];

    [label setText:text];
    [label setFrame:CGRectMake(CELL_CONTENT_MARGIN, CELL_CONTENT_MARGIN, .8*CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN)*2, MAX(size.height, 44.0f))];

    UIButton *button1 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button1.frame = CGRectMake(.85*width, label.frame.size.height/2-2*CELL_CONTENT_MARGIN, .12*width, 20);
    [button1 setTitle:@"UP" forState:UIControlStateNormal];
    button1.titleLabel.font =[UIFont systemFontOfSize:SMALLEST_FONT_SIZE];
    [button1 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [button1 addTarget:self action:@selector(upVoteA:) forControlEvents:UIControlEventTouchUpInside];
    [cell.contentView addSubview:button1];
    [cell.contentView bringSubviewToFront:button1];

    UIButton *button2 = [UIButton buttonWithType:UIButtonTypeRoundedRect];
    button2.frame = CGRectMake(.85*width, label.frame.size.height/2+2*CELL_CONTENT_MARGIN, .12*width, 20);
    [button2 setTitle:@"DOWN" forState:UIControlStateNormal];
    button2.titleLabel.font =[UIFont systemFontOfSize:SMALLEST_FONT_SIZE];
    [button2 setTitleColor:[UIColor blackColor] forState:UIControlStateNormal];
    [button2 addTarget:self action:@selector(downVoteA:) forControlEvents:UIControlEventTouchUpInside];

    CGFloat moduloResult = indexPath.row % 2;
    if(moduloResult>0)
    {
       cell.backgroundColor = [UIColor colorWithRed:1 green:0.647 blue:0 alpha:.6];
    }
    else
    {
        cell.backgroundColor = [UIColor colorWithRed:1 green:0.647 blue:0 alpha:.4];
    }
    cell.opaque = NO;
    cell.alpha = 0.2;

    [cell.contentView addSubview:button2];
    [cell.contentView bringSubviewToFront:button2];

    cell.selectionStyle = UITableViewCellSelectionStyleNone;

    return cell;
}

-(void)keyboardToJudge
{

}

- (CGFloat)tableView:(UITableView *)tableView heightForRowAtIndexPath:(NSIndexPath *)indexPath
{
    if(indexPath.row < [self.object.answerArray count])
    {
    NSString *text = self.object.answerArray[indexPath.row];
    CGSize constraint = CGSizeMake(.8*CELL_CONTENT_WIDTH - (CELL_CONTENT_MARGIN)*2, 200000.0f);
    CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:FONT_SIZE-2.0f] constrainedToSize:constraint];
    CGFloat height = MAX(size.height, 44.0f);
    return height + (CELL_CONTENT_MARGIN)*2;
    }
    else
    {
        return 200.0f;
    }

}

设置布局的函数：

-(void)viewDidLoad
{
...among other things setting up top scroll view (top part of view with gray background and orange text)...
   if(self.navigationController.navigationBar.frame.size.height>0)
    {
    self.scroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0, 5, width, height*SCROLL_VIEW_OFFSET)];
    }
    else
    {
    self.scroll = [[UIScrollView alloc] initWithFrame:CGRectMake(0, statusBarHeight+5, width, height*SCROLL_VIEW_OFFSET)];
    }
    self.scroll.backgroundColor = BACKGROUND_COLOR;
    self.scroll.contentSize =CGSizeMake(width, .5*height);
    self.scroll.delegate = self;
    self.scroll.contentInset = UIEdgeInsetsMake(30, 0, 30, 0);
    [self.scroll setShowsHorizontalScrollIndicator:NO];



...adding buttons to self.scroll...

    [self.view addSubview:self.scroll];

....


    self.tableView = [[UITableView alloc] initWithFrame:frame];
    self.tableView.delegate = self;
    self.tableView.dataSource = self;

    self.tableView.tableFooterView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, _width, _height*.1)];
    self.tableView.tableFooterView.backgroundColor = BACKGROUND_COLOR;


    self.tableView.tableHeaderView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, _width, _height*.1)];
    self.tableView.tableHeaderView.backgroundColor = BACKGROUND_COLOR;

....tableView hidden state is changed to yes in another function if row count is zero but not usually...
    self.tableView.hidden = NO; 
    [self.view addSubview:self.tableView];
...
}

最后，我也叫：

[self.tableView reloadData];

从网络服务器重新加载数据后，根据结果将 tableView 设置为隐藏或不隐藏（如果有结果要显示，则不隐藏）。那应该是触及 tableView 子视图的每一行代码。

Answer 1

添加到您的viewDidLoad

[self.tableView setBackgroundColor:BACKGROUND_COLOR];

设置tableView的背景色就可以了

Answer 2

改变这一行：

self.scroll.contentInset = UIEdgeInsetsMake(30, 0, 30, 0);

到这里：

self.scroll.contentInset = UIEdgeInsetsMake(0, 0, 0, 0);

您正在使用该行向tableview 添加页脚。下图来自 IOS 开发库

Answer 3

在尺寸检查器中将表格视图估计值设置为 0（取消选中自动）